Have you heard Sprint is releasing a new version of the HTC knight, which could possibly be renamed the HTC speedy. It is possible that this new version will be a slider phone, but that is still unknown. The release date is also unknown, but judging from the date of release for the "speedy's” case, it should be no later than January 6 2011.
HTC Speedy a Knight in Sprint armor coming January 6th? -- Engadget