It looked like, in recent candids on Mila's thread, they were outside somewhere, maybe a park, and he had both arms around her. Looked more than just friends to me...
Those pictures were from SoHo house, a popular, VIP restaurant in LA. They were outdoor on a patio, which is several floors up so for them to get papp'ed, photographers must have been trying really hard.
US Magazine, as someone else said, reported they held hands (not shown in those photos) and he kissed her on the cheek (I cannot refind it but there was one of this, in the bad quality of this set of images). Whatever's going on between them, Mila ought to stay mum on the topic. She's come out in 2 print interviews as well as three radio interviews saying the rumors are FALSE, "bull****", completely made up, she's single, etc. So if it turns out to be true, I see a lot of people throwing around the word "hypocrite" and "liar".