That talon is maybe the worst thing we could expect from a spore pod. Luckily, Skraat is obscenely bad-ass in CQC, so he's prolly gonna wind up with some new trophies and some Nid talon knives by the end of this arc...
Well, that claw doesn't tell us much what it will be inside.
It can be broodlord, genestealer, hive guard, tyrant guard, lictor, death leaper, pyrovore, prime/warrior/shrike or some new variant of creature including hive tyrant or gaunts since tyranids will morph pretty fast.
All we know its a nid now.