A better way to look at the current PPS is to wonder how it jumped to $1.17 so quickly. There was an expectation of a filing that DR repeatedly made. It didn't happen, so here we are.
There's little to support the current PPS in the short term- news of the filing will pop the price but it's a long time between filing, approval and commercialisation.
Even after the news of the FDA application is PR'ed, I anticipate the PPS won't climb parabolically higher until after approval. I'm content to wait the 2-3 years the until the gains are sustained and built upon by revenue, income etc.