We don't know exactly what CW is going to do about either a download or will it be DVDs only. However since 8.5 CW has offered both. X1 was available as a DL and on DVDs. I will assume it will be the same this time around too.
The DVDs cost an extra $20 and although I have been one that keeps saying to myself I will get them I haven't done so so far.
A boxed set is nice to have but I have already put all the DLs on DVDs myself.