Volkswagen AG (OTCPK:VWAGY, OTCPK:VLKAF, OTCPK:VWAPY) is pushing to bring Porsche (OTCPK:POAHY) public on Thursday, September 29, in an offering that is expected to be the largest IPO in Europe after more than a decade. The listing, however, comes at a time when risk sentiment is fading and when the economic outlook is clouded by multiple challenges. Porsche's rumored valuation of about $75 billion appears attractive. And the carmaker's accelerating strategy push toward battery electric vehicle ("BEV") cars could unlock a portfolio of premium electric vehicles that rivals Tesla (TSLA). Accordingly, investor interest for the IPO is high.