Sorry you probably already researched it, but if you still are interested in an answer, the meta has become very intel heavy. With the new yellow ping system, using mute, mozzie, valk, and zero has never been more important. The meta has also became more about clearing utility, though I think that's always been a part of siege (just now a little to much imho haha, its not quite as bad though as everyone makes it out to be).
Apart from that I don't remember what much has change significantly other than guns having new sights, which has been refreshing.
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