Ok so we got rainbow coins, but so far the main thing - free rainbow for 300 coins, is not imported yet.
Also I wonder if they ever add the random 5* tickets, you can get for D-medals. So far there are only manyus there.

Since they use completely different business model and approach, its hard to guess which features will make it in, what which wont.
Going by the previous record, you could say none of these that give you access to "free stuff", but then again, lately things have been improving under new leadership, heck we even got a free 6* from the FB promotion, so in the end who can tell really.