I would love to see an update. Aperture 3 is super buggy in Lion, and it's not just me who says this. I'm amazed that apple makes the computer, the os, and the software, but it still has issues.
Other than that, they really need to improve noise reduction, allow you to apply multiple edits to a single brush, and gradients, and lens profiles like Lightroom.
I've used both, and I prefer Aperture's interface, but they need to get in line with Lightroom or I'm pretty sure Aperture will just become a memory.