While I haven't read the stuff, isn't it possible that there are 2 ways to gain Skill Powers?
1. Swap a Utility for a Skill Power of that level.
2. Use a feat to buy a Skill Power, which would then be in addition to your normal Utilities.
I like this a lot. There have been times when I have wanted a Skill Power, but didn't really want to give up a Utility.
That's how I read it too -- basically choosing to give up a feat slot or give up a utility slot in order to get a skill power. I'd imagine the feat slot has some requirement such as 'can't choose a skill power that is higher than your level"
I didn't even -think- of the alternative until I saw it mentioned in this thread.
True, it -could- be either way (we don't know based on this info), but the previous preview material did not imply the need for a feat as well (of course, things may have changed since the preview material).