Shulkers can and will float if the block they are attached to is removed and they have nowhere to teleport to.
To Replicate
make a pillar in the air
place a shulker on the top block
remove all blocks from the pillar except the top block
remove the top block and watch it just sit there, mocking gravity
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Confirmed for 15w31b (also works by /summoning it).

Confirmed, spawned it way in air, not going anywhere.

Confirmed for 15w32b.
Confirmed for 15w38a and 15w38b
Confirmed for 15w39b
Confirmed for 15w39c
Confirmed for 15w40a
Confirmed for 15w41b
Confirmed for 15w42a
Confirmed for 15w43a

isn't it WAI? As shulker is "block mob", and blocks can float...
Wait for Mojang to confirm...
Confirmed for 15w44a

confirmed for 15w44b
Confirmed for 15w45a
Confirmed for 15w46a
Confirmed for 15w47c
"Works as intended" may be an exaggeration, but they're not supposed to be able to teleport great distances, and if they can't find a spot they simply give up and stay where they are.