In the "We all knew it was coming" news department, online retailer Shinseido has shown credence to the existence of the Rockman 10 Original Soundtrack. The single disc album is planned to release March 23rd for ¥2500 (roughly $27.49 US). Last time, the Rockman 9 Original Soundtrack came out a good couple weeks before Rockman 9 actually released, so this album may be releasing closer to Rockman 10's intended date. Still no word yet on a Rockman 10 Arranged Soundtrack, but I wouldn't count that out either.
UPDATE: Capcom's Rockman 10 page has some new info. The soundtrack will be a total of 46 tracks, and will come with a 12 page full color booklet. Furthermore, they are also announcing the Inti Bonus Disc Vol. 1. The disc will contain an arranged version of Rockman 10's title theme, a chiptune arrangement of Rockman 10's highway stage (Nitro Man), and a "non stop remix" of the eight boss stages from Rockman 9. There will be a total of 13 tracks. This album will also go on sale in March. Below is a partial track list of the RM10 OST:
01 USUAL DAY 02 FUTURE WORLD 03 SUSPICION 04 GO TOGETHER 05 TITLE 06 MENU 07 STAGE SELECT 08 GAME START 09 KING OF BLADES ( BLADE MAN STAGE ) 10 POLLUTED PUMP ( PUMP MAN STAGE ) 11 DESERT COMMANDO ( COMMANDO MAN STAGE ) 12 ABSOLUTE CHILL ( CHILL MAN STAGE ) 13 CYBERSHEEP'S DREAM ( SHEEP MAN STAGE ) 14 FIREBALL STRIKE ( STRIKE MAN STAGE ) 15 NITRO SPIRIT ( NITRO MAN STAGE ) 16 SOLAR INFERNO ( SOLAR MAN STAGE )