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Tenno (天皇) means in Japanese "Divine Emperor". Additionally, in the Buddhist faith, the Four Heavenly Kings (四天王, Shitennō) are four guardian deities who watch over each cardinal direction.  
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The Tenno are descendants of an ancient and mystical civilization of lost warriors from the Orokin era on Earth. Preserved in cryopods for centuries, the Tenno now awaken to a new war, fighting and resisting warring factions as the sole bearers of the Orokin-created Warframes.  While the memories of the Tenno have faded over time, their mastery of guns, blades, and Warframe exo-armor has not.

Fragments of history suggest that discipline and chivalry are the cornerstone values of the Tenno: is this true today? The Tenno are emerging into a world unfamiliar to them. One sees a noble warrior, building his strength against an oppressive regime. Another sees an opportunistic mercenary, exploiting the Warframe's superiority for wealth. Regardless of their future, the Tenno stand united against a common foe, loyal only to each other.

–Warframe Official Website

The Sentients had won. They had turned our weapons, our technology, against us. The more advanced we became, the greater our losses. The war was over unless we found a new way. In our desperation we turned to the Void. The blinding night, the hellspace where our science and reason failed.

We took the twisted few that had returned from that place. We built a frame around them, a conduit of their affliction. Gave them the weapons of the old ways. Gun and blade. A new warrior, a new code was born. These rejects, these Tenno, became our saviors. Warrior-Gods cast in steel and fury striking our enemies in a way they could never comprehend.

Excalibur was the first.

–Orokin 'Warframe' Archives (Excalibur Codex Entry)

Upon revival from cryostasis, the Tenno are guided by a figure known as the Lotus. Asserting preservation of her people by any means necessary, the Lotus dispatches and guides Tenno through missions of espionage, sabotage, defense, extermination, interception and rescue. On these missions, the Lotus guides Tenno using audio commands transmitted from an unknown location. Like the rest of Tenno culture, she remains shrouded in mystery.

Some weapons bear the Lotus emblem to distinguish them as being unique or Tenno-altered, while other weapons bear the symbol simply as a trademark of Tenno construction. Hostages liberated during Rescue missions appear to be human, and wear jumpsuits that bear the Lotus emblem. It is suspected that these hostages are human, or are unarmored Tenno.

For official Videos made by the developers, check this channel:
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There's a pretty good presentation on most of the frames.

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NEW UPDATE IMPROVING EXCALIBUR!
 
Complement Excalibur's updated powers with these new items, available in the Market now:
PRISMA EXCALIBUR BUNDLE
Let Excalibur stand apart with skin and helmets forged from the purest Prisma Crystal.
 
PRISMA EXCALIBUR SKIN
This Excalibur Warframe has been coated with liquid Prisma, enriched by pure Void energy.
 
PRISMA, PRISMA AVALON and PRISMA PENDRAGON EXCALIBUR HELMETS
Three new, unique helmets for Excalibur, coated with liquid Prisma and enriched by pure Void energy.
 
EXCALIBUR PROTO-ARMOR SKIN
Discovering the precise nature of the Excalibur Proto-Armor Skin has proved elusive. Initial attempts at dating point to ancient origins, perhaps even predating Orokin Empire. Get it from now until June 24 at 2 p.m. EDT -- when it's returned to the Vault.
 
PRISMA EXCALIBUR and PROTO-EXCALIBUR NOGGLE STATUES
Decorate your Liset with new Prisma and Proto-Excalibur Noggle Statues!   
 
Excalibur Rework
 
No matter your play style, Excalibur is always a formidable Warframe choice.  With newly re-worked Abilities, he is now more versatile than ever.  
 
The following changes have been made to Excalibur’s Abilities.  Please note that we will continue to monitor these changes after launch to make any necessary tweaks to balance.
 

• First Ability: Slash Dash: Slash Dash will now target enemies within a conal distance from Excalibur, targeting all enemies within the range of cast.  Enemies hit by Slash Dash will count towards the player’s melee combo counter.
  
• Second Ability: Radial Blind: Cast on the move and opens AI to finishers.
  
• Third Ability: Super Jump has been removed from Excalibur’s Abilities.
  
• Third Ability: Radial Javelin is now Excalibur’s third Ability and costs 75 Energy to activate.
  
• Fourth Ability: New Ability: Exalted Blade: Excalibur summons a sword of pure light and immense power.
  
• Stat changes: Excalibur Armor:  Excalibur’s base has been increased to 225 and to 250 for Excalibur Prime.
  
• Excalibur’s Abilities have all been given a visual overhaul in line with his new Exalted Blade ability.