I found two legendary engrams over the weekend. One from daily heroic, one from Iron Banner. Helmet and Chest engrams.
I noticed that they both now say "RARE Item" under possible contents now:
Rare Item
Legendary Item (Random Class)
Exotic Item (Random Class)
Upgrade Materials
I stuck them in my vault and haven't decrypted them yet to prove it, last time I found one it didn't say rare as possible contents.
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It's possible to get rare items from legendary engrams. Happened to me and a friend once. Just like how you can get legendary items from blue engrams.. Rare but it happens