Day four had a few random things posted on different sites, that were allegiance themed, without revealing anything new... but then the MP Movie Optimus was officially revealed at a Chinese event, that was then piggybacked by Hasbro America with their press release and official images (but I don't think it was noted as being part of this 5 day promotion).

Day five, the final day, had two videos posted up on the Transformers facebook page. One had a montage of movie scenes with a voice over that was meant to be Optimus Prime, but was definitely NOT Peter Cullen. Probably Jon Bailey, or some other stand in that you here on a few of the Optimus toys that say lines as their electronic gimmick.
The other video was about 2 minutes long, showing Hasbro America employees revealing their allegiances.

Hopefully their next coordinated global promotion for Transformers is better planned out than this one... but I guess they might be leaving their full attention to Transformers in June when the movie comes out, as they might be too busy getting ready for next month's 40th anniversary of the first Star Wars movie (May 25th 1977), along with their May the 4th Star Wars day that happens next week.