YTTV already has all of these channels so it would have to be rather cheap, most of what I watch is sports so if the new app is only $30-$40/month I would certainly consider it.
It will include offerings from 15 linear networks: ESPN, ESPN+, ESPN2, ESPNU, SEC Network, ACC Network, ESPNEWS, ABC, Fox, FS1, FS2, Big Ten Network, TNT, TBS, truTV.