I see no purpose in this, all they have made under MS funding is probably lost, so they have to start from scratch. So unless they want to rub in MS face (doesn't seem likely since they are on amicable terms since crossplay on Minecraft and other ventures) there is no point in using the name, plus the concept is probably also owned by MS. So they have nothing but the name to use.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
http://gamrconnect.vgchartz.com/post.php?id=8808363
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
http://gamrconnect.vgchartz.com/post.php?id=9008994
Azzanation: "PS5 wouldn't sold out at launch without scalpers."