Things that make you go "hmm." And make all the old guys jump up and say "I knew it!"
Looks like the long-term plan under evaluation is to go to 7.62 and then retain the ability for a barrel-and-bolt swap for something else around 6.5mm. Strange that 6.5 Creedmoor isn't mentioned in the article as an option; I know that's the latest flavor of the week amongst the civilian big-bore AR crowd.
http://soldiersystems.net/2017/04/05/us-army-considers-7-62-interim-battle-rifle/

http://soldiersystems.net/2017/04/05/us-army-considers-7-62-interim-battle-rifle/