I have assumed that they took down the possibility to order the old version when the new one is coming 
Yes, it does seem a bit odd, eh?
I get that a printed version would tie up a lot of money and so they may want a return on the investment they've made on the box set first.
But a PDF!? That could easily be made available.
Especially since they are making announcements about a second edition, which you can't actually buy on its own without having to fork out £95 on miniatures and terrain you don't actually need since you have loads already, but still leave the patchy first edition for sale.
I hope that doesn't create ill will and blow up in their faces. Whoever is in the marketing department is clearly also working a second part time job or this is their first job in marketing. I hope they know what they are doing.