You can make a turn-based RPG, but you need to event it yourself (it isn't some pre-made system). It really isn't terrible to make, but you do need to be familiar with C2's event system.
It depends on what sales are going on at the time for upgrade costs. Scirra's pricing is listed clearly on the buy page.
The start of the wii u exporter is available now and the rest of the exporter will be rolling out very soon, but you must be a certified Nintendo developer to have access.