Woohoo! Another big milestone reached, congratulations on making it this far! Toddler will definitely be enjoying sharing space with other toddlers now, and they may play quite noisily but peacefully side by side, but don't expect any real "together play" just yet - they still don't know how to share toys or decide together on the rules of any game. She will probably be very fussy about getting "her way" when it comes to play, and having this "just right" as she sees it, so expect her to undo anything you do when you're trying to play with her.
Talking is really coming along by now; she could be having three-weord conversations with you (simple ones, of course) about, for example, what she is doing, what something is, how she is feeling, and that type of thing. Slightly more advanced instructions like "let's go find where the cat is hiding" will be understood. She may also be asking "why" quite often now - this can be a bit tiring but try to stay patient because the more he questions the more he will learn.