Hi Carolyn!
I love the 10K distance, so the new 10K races at Disney World are super exciting to me, as well!
I have a feeling that the 10K race is going to sell out very quickly. When they introduced the 10K for Disneyland Half weekend, it sold out within hours. Since the Disney World 10K is part of the Dopey Challenge, I look for it to sell out fast too. I could be wrong, of course, but I do think it will be a fast sell-out.
If you are doing a 5K in April, then I think you will be plenty ready to do a 10K by next January. I use the
Galloway run/walk/run method, and with it, I feel like I can conquer any distance! You can visit that link to see his runDisney training programs and also find more information about it at www.jeffgalloway.com.
I hope this helps! Please let me know if you have any other questions.