Warframe's TennoCon 2021 was this past Saturday and there was a lot that was shown. You can watch the whole 6+ hours TennoCon stream on YouTube here. Below I've embedded the more important parts of TennoCon.
TennoCon 2021 | TennoLive
Video description: Warframe's highly-anticipated update, The New War is arriving later this year simultaneously on all platforms! Join Live Ops and Community Director Rebecca Ford and the Devstream crew to catch the full gameplay reveal of The New War and much more!
TennoCon 2021 | The Art of Warframe Panel
Video description: Join host [DE]Danielle, Art and Animation Director Geoff Crookes, Weapons Lead Kaz Adams and special guest, Concept Artist Keith Thompson, as they take a look a look back at some interesting concept art, and discuss the inspiration behind their latest creations from the highly-anticipated update, The New War!
TennoCon 2021 | Live Developer Q&A
Video description: Join host [DE]Megan, Senior Game Designer Pablo Alonso, Lead Concept Artist Eric Vedder, and Senior Animator Elyse Gymer as they answer #Warframe questions from Tenno around the Origin System! Recorded live during TennoCon 2021.