It's too early to say for certain, but Simon Jones has shown encouraging early season form (in spite of his stiff neck), writes Steve James in today's Daily Telegraph:

He did, and faced his mates early in the season, as all movers seem to. In truth he didn’t bowl that well, recording so-so figures of 6-0- 43-1 in a shortened game, but the more important pointer was that the venom appeared to be back. A couple of slippery bouncers to Glamorgan skipper David Hemp showed that. The accuracy will come, just as it suddenly appeared in 2004/05 after his wayward early years.