The deadline for changeover was originally 7th April 2012. EASA have allowed individual States to extend the transition period for compliance, I can't unfortunately remember for how long but certainly for some years. The UK CAA have not taken advantage of this option, other than to allow themselves a few months more time before they start issuing EASA licences. Most States have put the transition back by several years.
I'm not totally clear on this but, from what I can glean from the documents, if you transfer your licence to the UK's control now they will issue you with a JAR CPL ME IR, if you leave it until after the summer they will issue you with the EASA equivalent and, if you leave it under the HCAA's control it will become an EASA CPL ME IR in the fullness of time when the HCAA decide to implement the EASA rules. 2017 sounds a little far in the future, but one assumes the HCAA would know their own deadlines.
I would leave it as it is. I can't see any advantage in swapping States now.