If there are some places you know for sure you want to try, I would make those ADRs as soon as you can. I don't know about how full it will be in January because I've never been at that time...but I know that it's tough to get some ADRs no matter when you go! We made our ADRs for our December trip a few weeks ago and there were a lot that we couldn't get. The CM told us that Coral Reef and LeCellier were booked through February and 'Ohana was booked through January! If you want to keep it flexible, you could leave some days open and then plan those when you find out about P&P. Whatever you do, have fun planning and a great trip!
"Any wish is possible. All it takes is a little courage to set it free!" Jiminy Cricket
18 trips to WDW and counting! Stayed at: Poly, WL, Kidani, SSR, BLT, BCV, CSR, VB, & POR!
Next Up: May '13 - Jambo & OKW
DVC Member & PAP holder since 2008!