Quickoffice is in WebOS 2.0 as you have probably already seen in other places. I will give you a quick rundown on the four file types I tried.
Doc/Docx - no pinch to zoom, tap to zoom only
ppt/pptx - pinch to zoom inside the slide area (not the whole screen) and free scrolling while zoomed, but the file I tried had a drawing that did not come through properly.
xls/xlsx - no pinch to zoom, tap to zoom only. It appears to be fairly feature rich with a dropdown in the title bar for other sheets/tabs that are in the workbook. Also has a nice cell content feature where the selected cell shows up in a button at the bottom of the screen, you can tap it to see the full content of the cell including formulas if there are any.
pdf - pinch to zoom works as expected as does free scrolling
I am sure there are probably more features that might be present within the various doc types, I just didn't see them.
All in all, it is a work in progress. Hopefully good things will come.