Recently posted as news was two of the four sets of cancelled Universe Robot Heroes being listed on ebay (as loose samples), and now the other two have been found on ebay, giving us a first look at the Beast Machines pair (the Gen1 pair were pictured on the last wave packs).

http://www.seibertron.com/transforme...serbeak/17148/

The four sets that were cancelled:

Optimus Prime vs. Megatron (Robots in Disguise)
Prowl vs. Laserbeak (Generation 1)
Victory Saber vs. Dessaras (Generation 1)
Optimus Primal vs. Jetstorm (Beast Machines)

If they don't ever see production some day, the ones one ebay will be some of the rarest TFs toys in collector's hands.