Yes, we will do this once we flip the switch in making them official. You may have noticed the recent change of time_t on x86_64 to 64bit, which avoids the year 2038 bug (the good news here is that in 2038, we will be forced to drop BeOS compatibility if it survives that long).
Anyway, the idea is that for a few months (weeks?), we devs are still allowed to make breaking changes like this to x86_64. Once we make it "official" (with logo and everything), we commit to some level of ABI stability so such changes won't be allowed anymore. This is why we aren't in a hurry to make the change. It is not just about sticking the Haiku logo on it, but about what showing this logo means in terms of finishedness of the system.