My Netgear Wireless card on my Laptop is 16bit 5V. So, there is still being cards manufactured for that standard. But I guess some high performance cards may use 32bit and 3.3V.
Anyway, wireless support for Amiga may not show up sone because the lack of 68k drivers. (Manufacturers can't release the source or specs due to FCC compliance rules)
For the USB ones check the specs. There are more 16bit 5V cards on the market than you think. But, ofcourse you have to make sure you can get a driver for it.