Is this module available for sale in market?.
will public sale soon , about one or two weeks .
Does it support Linux like Ubuntu/Debian?.
yes, we have test it on linux and lede.
Can I interface Quectel EC25 MiniPCIe (http://www.quectel.com/product/ec25minipcie.htm1) module directly on BPI-R2 board since it has onboard MiniPCIe slot?.
this module is USB interfact for M.2 ,so can not use onboard slots. you also can use it with BPI-4G extension