I hope Apple gets all the developers on the Universal Binary program and keeps them there -- it always keeps the IBM door open should Big Blue see sense and pay more attention to making the G5 efficient on power.
As for what's coming out this next month? If you're holding your breath on an Intel replacement for the G5, don't. The current G5 models are very strong by industry standards unless you're a monomaniacal gamer. It's the G4 models that are being rendered uncompetitive by the arrival of the Yonah chip. So my prediction is for the iBook and Mac Mini to be dealt with. The larger Powerbooks stay PPC until the summer -- I hope the 15 and 17 inch Powerbooks get one last PPC boost with the 7448, but that will be up to Freescale, whether they have been able to provide Apple over the past couple of months with chips that actually work (Apple has already done the necessary engineering on the motherboard, as the current 15 and 17 models have the faster memory, new power management and so on that pave the way for the pin-compatible 7448 to actually deliver real-world improvement). The 12 inch Powerbook is done for; a widescreen Intel iBook will provide a temporary replacement for the 12 inch PB until new ultra-low-voltage Yonah chips in late spring or early summer provide Apple with an opportunity to finally break their lightest-notebook record that has been held for so long by the Powerbook Duo.