I am in full agreement with regard to the HD 2400, and having perused the ATI / AMD (and Nvidia) list of graphics cards, I can only see a total replacement for both the 2400 and the 2600 (rather than an increase in VRAM).
Interestingly enough, I think having a 2400 inside the mini would drive me NUTS, since then the decision to upgrade to the iMac would be that much harder (since the line between the two models would start to blur).
I am all set for purchase as soon as the update comes around, but I think I will go for the iMac, because the x3100 inside the mini will be just *infuriating*, and even if they could put the not yet released
GMA X4500 inside, it will probably still pale in comparison to the HD 2400. I simply can't bring myself to splash out £399 - £499 ($599 - $799) on a Mac that might only barely match my four year old Geforce 5200 128 MB in my (fathers) 7 year old PC. Even the iBook I am typing on now has dedicated graphics
In addition, the possibility that this might all take 4 months is really sad, since I am not waiting for the sake of waiting. I just think when buying a £799 ($1199) computer, it should have a graphics card that gives you solid (and relative future proof) performance, even if it is the bottom of the iMac range. I still have a niggling feeling the iMac might get updated tomorrow or the week after, even if the mini is stuck for the next few months in engineering at Apple.
Peace and God Bless!