That's what Purac is claiming for a new PLA (polylactic acid). The trick to acheiving this performance leap is not the result of any additive or modification of the monomer by the addition of various moieties, but instead occurs at a more fundamental level: the polymer is a block copolymer of both the D- and L- stereoisomers. There is no mention of the level of blockiness in these polymers (are they di-block, tri-block,...?), but I imagine that the blocks are not able to co-crystallize and will instead phase separate and crystallize separately. I'm also not able to find anything suggesting that the D- monomer will also not be as biodegradable as the L- monomer is, but that should certainly be confirmed.
It's pleasing to see a simple change in monomers that can produce such a large change in a polymer. (And what about those people who thought that chemists couldn't do anything new with C, H, O and N? Heck, this didn't even need the N!)