Before you move, it is better to do a ground up work on the same. It helps to grasp the technology easily. Hits some good sites regarding IPv6 and participate to some good forums (like ITKnowledgeExchange.com) and gain some knowledge before moving!
Already I answered a question about IPv6 here.
And have already discussed Microsoft Cisco certification here. Here is another good reference for starters too!
Happy to inform you!
If all you want is knowledge of IPv6, the web is chock-full of data and links and training materials for it. Those are nice, but few show you how to actually use it.
You mentioned not looking at the CCNP, but, as you have a CCNA already, check out the CCNP ROUTE materials – they have a complete section on IPv6 concepts, design and implementation.
If you’re not into the Route/Switch path, There is always 2 other HUGE areas to move into: Voice or Security. Both are in-demand and pay really well. Cisco offers the CCNA-V and CCNA-S certs if you wish to pursue careers in eith of those fields…