To tide me over until then and being able to practice fretless bass playing I also ordered this one:
http://www.thomann.de/gb/harley_benton_hbb500fltbk_5string_fretless_ebass.htm
It arrived last Saturday and turned out to actually be decent for the price. Playability is ok, fretboard is straight, electronics are working. Sound is not bad either... the pickups are pretty weak but I can compensate easily with gain on my amp (still only at 4 with that one).
So for starting out on fretless, this is a nice one. Doesn't hold a candle to a nice Warwick or Sandberg fretless, though!