On their ann PHYLOGICA ADVANCES COLLABORATION IN MEDIMMUNE...

On their ann PHYLOGICA ADVANCES COLLABORATION IN MEDIMMUNE ANTIBIOTIC DISCOVERY PARTNERSHIP dated 21/11/2011 They state:

Under the terms of the agreement, to date Phylogica has received payments of
US$1.5 million and is eligible to receive milestone payments of up to US$98 million,
in addition to royalties on potential worldwide sales.

Also in this ann it states :
The joint research programme is on track and Phylogica has
recently completed the methods validation and progressed to the final stage of the
Research Plan with its Phylomer-based constructs.

Just wondering what a milestone payment is...if they are at the final stage of the research plan, is a milestone payment due at the end of this research plan?? Would be interesting to know what happens at the end of this reseach plan seeing as it is in its final stage and they are so upbeat about its progress.

Any thoughts