There have long been rumors and reports that WWE would eventually transition Lana from speaking in a Russian accent to American but they've never given any real indication on television that this was the plan. She may have done just that on her Twitter earlier today:
I decided to take accent classes ..... On top of speaking 3 languages I am going to start doing accents...Because I'm that good— LANA (@LanaWWE) September 25, 2015
Lana is currently recovering from wrist surgery and expected to remain out of action for up to four months. That doesn't mean she'll be off television for that long but it looks like they could be advancing stories in her absence.
There's no way to know if this is the plan, of course, but don't be surprised if she's dropped the Russian accent upon her return.