1) hassle-free migrations from your local MongoDB replica sets into Atlas cluster by means of initial sync and oplog tailing
2) more AWS regions with VPC peering support -> including 3 EMEA regions. besides London & Dublin especially interesting is Frankfurt (Germany)
3) probably my personal favorite. next generation snapshot based point in time recovery with query functionality to get document level granularity -> partially restoring documents has never been easier.
can't wait to try all of these enhancements!