Moteijunas is like a 7'0 SF, much like Dirk. He has incredible skills and coordination for a guy that height, and seems like an intelligent and good-natured kid (unlike a certain European Detroit Pistons #2 pick).
This is a video that kind of demonstrates what he is. Not a spectacular dunker or dominant shotblocker, but the skills and natural scoring ability at 7'0 make him a commodity.
The kid will need to bulk up and toughen up to reach his full potential as an NBA PF, but barring an unbelievable college season by someone other than John Wall, or an injury to Donatas himself, he will most likely join Wall in being drafted in the top 2 based on their extremely high ceilings.