I agree with the critics that since ancestral yeast was multi-cellular, the yeast in this experiment was able to express genes producing atavistic characters for multi-cellular (MC) behavior.
I would expect in this case that MC behaviors in this case would show evidence analogous to the bony atavistic tails of humans beings; that is, something that doesn't quite work so well.
Either way, the follow-on experiment with algae is a logical next step.
Related advances:
Craig Venter's team creates artificial life
http://www.scientificamerican.com/article.cfm?id=synthetic-genome-cell"Synthesis of activated pyrimidine ribonucleotides in prebiotically plausible conditions." by Powner MW, Gerland B, Sutherland JD.
http://www.ncbi.nlm.nih.gov/pubmed/19444213It's a lot of work, but slowly humanity is chipping away.