New model looks like being £10K+ more so I'm not too worried about the affect myself,  range also isn't going to be a huge step up so it's going against a Kona/E-niro and I would probably go with one of those,  well actually I think they should be down near the £25K mark so I would just wait if the MG5 current price wasn't an option.  
I actually think that these current MG models might be the last of the affordable options for about a year until the Chinese flood the market,  big shift in the car industry coming....