Kane
Kane has been out for the past month due to a variety of nagging injuries, according to Dave Meltzer. No word on his possible return date or what the specific injuries are.
Erick Rowan
Erick Rowan, who has been out since October after surgery on his torn rotator cuff, is getting ready to return soon and has been training at the WWE Performance Center. His initial return timeframe was 4-6 months. He is expected to get back into the Wyatt Family angle once he returns. Will be interesting to see where they go with that, with Luke Harper splitting from Bray Wyatt and Randy Orton also likely eventually splitting from Bray.
Source: Dave Meltzer and Wrestling Observer Newsletter