Yea, I doubt it will have much impact on price, and if anything may be a sell on the news type of event, but you never know, it could give some a reason to buy more.
Considering the prospects of this project and launch of the GameCredits Store very soon after the MobileGo ICO ends I'm sure this halving has very good timing and I am sure it will have a great impact on the price in the longer run but I also doubt if we are talking about immediate results.