I’d agree with Jason. Team events (even team unified modern) don’t really tell the whole story and are unlikely to really cause a wave of price changes. Unless a very different and very new deck is very successful it is unlikely that we see people buy into new decks.

It really depends on when you want to play with them. If you’re just collecting waiting until December is usually the best. Unless some deck breaks out (which nobody can really predict) there are unlikely to be really big shifts in card prices until more reprints happen (which again, nobody can really predict). December is by far the time that most cards hit their low due to the holidays. There are no grands prix in December and interest in competitive Magic is low as people visit family during the holidays.

If you have the patience, wait for a reprint and then wait for December is the basic rule of thumb.

The split events generally don’t have as big an impact on things, in my experience. There are just so many other variables mucking up the Modern-specific data. My guess is it will have some effect on prices, but not a huge one.