Capela is going to play in Hoops Summit very soon, and will have serious challenge on his hands as so far DX has him listed at 211 (in November he was weighed at 218 by the team - kinda small to play against grown man, but Anthony Davis measured at 221 at the Combine, and even though he doesn't have Anthony's frame, Capela should have no problem bulking up by his sophomore season): USA team will have bulky aggressive guys like Okafor and Alexander. This will be very important test to gauge his ability to handle NBA-level bodies. I imagine Towns Jr. will be back, and at least Capela won't have to deal with Emeka's cousin full-time.
Reading 2012-13 reports on him, it feels like Capela wanted to play as SF, which resulted in .424FG% last year among other things. But this season the bulb went on, he moved inside, dunking on everyone, though for now that's all he's doing offensively. Jumper is pretty far away, if it even appears down the road, so right now his offense will consist strictly of being the rolling man in screen action, dump-offs at the rim and offensive rebounds. Still getting above 65% from the field against grown men is quite an accomplishment. Interestingly, he averages 2.5 assists per 40 minutes, which for a finisher is impressive, though corresponding TO rate is equally worrisome. He's a very good rebounder, and his team routinely wins rebounding battles, so he's certainly not in a situation, where "someone has to get a rebound".
You can't argue, that main measuring stick for him is OKC player, and Capela comes out very good in comparison, though one can't deny level of ACB is higher than PRO1.
Information is still very scarce on him, all video available are mixtapes, so hard to get a reliable read on him, other than his tools and the fact, that he clearly progresses, getting 20 mpg after 8 mpg last season, plus he improves during the season, getting 23-26 minutes instead of 13-15 early in the season.
Here's an article with some background and probably most informative piece on Capela, written in English:
http://www.eurohopes.com/player/1146/clint-capela/.
P.S. My current grasp of the draft is that outside of jumping into the top-3, Kings shouldn't keep their pick. Dangle it in front of Chicago and Atlanta to see, if they let former Gators go, explore some other options around the League. If hunt for inside defender fails, trade down for Capela (or maybe WCS - I'm really unsure about him) and maybe pick up perimeter guy like RHJ (if he declares) or Adams.
EDIT: Another solid game for him today - 17 points (7-8 from the field), 11 rebounds, assist and 2 blocked shots in 25 minutes in home game vs top-5 team. Capela's team Chalon is now 7-3 over last 10 games. Interestingly his importance to the team should've prevented him from participating in Hoops Summit, but apparently after the game on April, 5th their next game is on 15th, so he should be able to come over to USA.