We don't know which products might be involved, but the Mac would be a good candidate, as the multicolored Apple logo was used on the original Macintosh in 1984 and on many other Apple computers before and after it. iPhones and iPads could also be suitable — perhaps special editions along the lines of (PRODUCT)RED.
To be clear, this rumor could very well be untrue. We have elected to share it since it comes from a tipster who has longstanding connections to both Apple and related industries, but no other sources have shared similar information that we know of. And, even if true, the plans could certainly change.
Apple's rainbow or "six-color" logo made its debut on the Apple II computer in 1977 and was widely used until 1998, when it began to be phased out in favor of a monochrome Apple logo similar to the one used today.
Despite not officially using its rainbow logo in over 20 years, Apple has continued to embrace its colors over the years.
Apple Park was recently decorated with the colors of the rainbow logo in celebration of the formal opening of Apple's new headquarters, and as a tribute to Steve Jobs. The colors were splashed on stairs, walkways, coffee cups, and even a stage with a rainbow arch used for an employee-only Lady Gaga performance.
Apple's departing design chief Jony Ive recently reflected on the rainbow's significance:
There is the resonance with the rainbow logo that's been part of our identity for many years. The rainbow is also a positive and joyful expression of some of our inclusion values and I think that one of the primary reasons the idea resonated so immediately and so profoundly with us was the form -- the connection from an aesthetic design point of view. A semi-circle relates so beautifully and naturally to the form of the ring.Again, we do not know if this rumor is true, but our tipster is reputable enough in our opinion for us to at least share what we have heard.