The box-office hit "Waiting to Exhale," starring Whitney Houston and Angela Bassett, will be released by FoxVideo on April 23 at $20 a copy. . . . Cable's Cartoon Network will begin showing "Speed Racer," the half-hour series that 30 years ago gave a generation of Americans their first exposure to Japanese animation, on weekdays at 2:30 p.m., starting March 4. . . . Actress-author Joan Collins has inked a pact with Lifetime Television to host a series of summertime specials.