I totally agree in the case of storage. I have a 16GB that's got just under 1GB left (I don't/can't use my phone for music so I kept my 64GB iPod).
Removable battery doesn't really bother me but if one needs it, then yes.
If one wants a phone now and doesn't care about improvements or is getting a significant discount, I'd say it's still worth going for. This phone hasn't become bad just because of the G3.
Well the phone is R299 per month, and currently I'm paying R359 for an S3, and from what I've seen and heard this is an excellent phone.. I'm also worried that when the G3 comes out it will be R400+