I'm not certain they're ever going to "have" to trade anyone significant. We're already past the point we thought we'd be to be cap compliant, without having to make any moves. It wouldn't be at all surprising if injuries continue to solve the problem for them.
Immediately, I'd expect that some of the excess forwards get shipped back, particularly Conner and Z. It wouldn't surprise me if Jeffrey is waived if they need to make more room once Neal/D'Agostini are ready. I'm pretty sure that with Vokoun on LTIR, they stay cap compliant even with Neal and D'Agostini back, as long as they cut some of the small fat that I mentioned.
So they'd have a roster with 13 F (D'Agostini the extra), 7 D (Bortuzzo #7), plus Engelland as a swing man, and two goalies. I'd expect that's what they'll roll with. They won't have to make any other kind of move until Vokoun can come back, which isn't a guarantee. And by then it's possible someone else gets hurt and it becomes moot again.
The one guy I expect to be traded, and he's one that currently has no impact on the NHL team, is Despres. Maatta has already passed him up, which further pushes him out of the picture this season. Even next season the picture still figures to remain crowded, plus you'll have Pouliot going pro, along with Harrington and Dumoulin still around. Despres is the best trade bait they have and it may be a sell high while you can situation with him.