The ticket office haven't got any news about tickets yet, but I can't imagine it being a problem. We're hardly likely to sell our allocation and even if we do there should be home tickets on sale on the day.
Rödinghausen is very remote though it does have hotels and B&Bs. The station (Bieren-Rödinghausen) is a mile and a half from the ground and the town's a further 2 miles. Unfortunately, the last train leaves a few minutes before the match ends, but it would get you back to the major towns like Dortmund and Bochum.
I'm just going to the Bochum game and have got a cheap flight from Gatwick to Düsseldorf. There's a direct train from the airport station to Bochum (35 minutes)