1) The enemy Ginjo's talking about is the new enemy that will appear in the arc after this.
2) The enemy Ginjo's talking about are the Shinigami (Kinda doubt this one).
3) Ginjo is just lying out his ass about Tsukishima's ability disappearing after he dies, and is also lying about another enemy just to mess with Ichigo so that he can cut him down when he's distracted.
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Quote from Klapzi
The cool part is that I never get tired of being deceived
Quote from tactics
Just because someone's head was chopped off doesn't mean they're dead. That's just silly.