I think the pre-register time ends between today and tomorrow.
It reaches 100k signatures, so..a success? Maybe but it's a good sign and looking the track record of SN, another hit will be a win.
It's important to note that this app has more money invested in that R&D than the other ones. This is because they need to improve after the market is starting to make big hits from a lot of companies (big and small ones) and the delay of World's End Eclipse revealed -at least the Mobile/Vita version- the last TGS.
Why? Because they didn't want to repeat the same mishaps with PSO2 (PC release in 2012, Vita one in 2013 and a Mobile version in 2014!!, not a good movement implying the condition of the market).
Also, they has started to contract new people for their last reinvigorated Online R&D Division (PSO2 team, now subdivided as "PSCrew").
EDIT: Actually, the app was released this morning for both markets. I heard some good responses about it.