The AR15 trying to be like an AK in that it's adopting a larger intermediate caliber round of similar power of a 7.62x39.
That doesn't make any sense. The ballistics are rather different between 7.62x51 and 7.62x39. The design philosophies behind the two rifles are rather different as well.
If anything modern AKs are trying to be like ARs. With the caliber change to 5.45x39 (copying the 5.56x45 concept, much like they did with 7.62x25 and 9x18). Even that picture you linked to uses multiple parts/features originally designed for AR-15s, including pictianny rails and AR-15 stocks in addition to western optics.
Here is a video of Russians with Eotechs (or clones):
[url=http://www.youtube.com/watch?v=0x-CcWPgIzQ&feature=player_embedded]ЦСН ФСБ