If it were another '09 recap, there'd be a lot more to say. Hill appeared in a whopping 83 games last season, collecting 253 at-bats in the process. He was pretty ungood on offense, posting a .237/.312/.324, but at least he tried.
But let's talk about 2010. This year, if Soto's apparently super-healthy appearance is worth anything, Hill won't get near as many at-bats. In 2009, Soto and Hill combined for something like 650 plate appearances. And in 2008, a healthy Soto took about 550 for himself. So Koyie might get 100-200 PAs in 2010, which is really too few to cause a huge ruckus.
At any rate, he's good defensively, so that's nice. Pretty much your perfect backup catcher, for what it's worth.