It's not a splitpush meta, otherwise we'd be seeing a LOT more brood and lycan. Splitpush was back in brood/lycan/morphling time. Lycan and Morphling haven't been relevant since the end September 2012 (aka v6.75), and Brood has been falling down gradually since July 2012 but really started to accelerate into oblivion after 6.75 just like Lycan and Morphling.
The only time there's anything even vaguely resembling a splitpush meta is when KotL and PL are in the game. And realistically that turns the game into more of a siege game than anything else. Right now the meta revolves around early ganking, roaming, picking heroes off, accelerating the point at which your carry can be relevant so you can force teamfights during the midgame, and group pushing towers. It's also very heavily focused on aggressive trilanes and shutting down the enemy carry during early and midgame.