like a few others have said , around the 50k satoshi a coin mark i reckon . it might advance further completely depends on the news and it might not stay too long up their till dropping back down and stabilizing or consolidating or whatever.
There are some coins in the history of crypto that have risen 2400% in a matter of days or over a week in their history , litecoin, doge, darkcoin . even bitshares had an impressive rise at 1 time. i don't however think this will happen on release but at a later date once things hae developed and people have started getting use to it and perhaps news of high profile people joining the network and contributing
remember also there will be a small period of 1-2 days were prices on poloniex will wildly become inflated as people pull out coins from poloniex to convert them and transfer them over to the safenetwork, some people will be keeping their coins behind just for this, as the interest grows from the impending swap and release, more and more people will be interested in buying the coin while at that point more and more people will be withdrawing and putting them into safenet, now for the first few days of maidsafe purchasing on the actual network itself will be semi difficult for the first day or so as things get initialized .
so what to expect?
a crazy price action that sends it high above actual market value for a short time and then one the network has fully changed over and as it does a slow decline in price as things normalize again and easy access to purchasing is there to use.
actual market value meaning its a bare bones experimental network, while i myself have high expectation and hopes for this project and have for over a year now , it doesn't take away the fact that once launched it is a bare bones network and value and purchasing will be mainly speculatory