from ddrfreak.com:

To celebrate the holiday season, Konami will be offering a limited-time free download of SP 26, which will contain one song, a nifty remix of Love Me Do. This song will be available for approximately two weeks starting sometime between Friday, December 16th and Monday, December 19th, and will also coincide with the availability of SP 14, which is known to include Neverakka's Evolution, the first track from the Ultramix 3 V-Rare sampler.

as a fyi, songpack 25, which is a free download of 250bpm, is still avalible as of this post [dec. 19] as well. so if you have xbl and one (or 2, or all) of the ultramixes, get 'em while you can.