The new range of Rescue Bots of Figurines that are replacing the 2-pack figurines are now out in America for US$5 (Boulder & Heatwave).
The 2-packs were US$7 each, so I'm surprised that the removing the human partner was not just a cost-cutting measure to keep them at the same price-point.

(a pity though, as this was one of the rare opportunities to get human toys of the Transformers Universe - humans are usually the main focus or cast member of Transformers cartoons and Movies, yet strangely enough we rarely get toys of those central characters)