In the company's quarterly earnings call with financial analysts, HP CEO Meg Whitman revealed HP "will be well positioned on Windows 8 x86 by the holidays":
She added later that "we're rooting for a fantastic Windows 8 product that's out on time for holiday." That would seem to suggest at least a little bit of doubt about the Windows 8 launch date but since Whitman was talking with financial analysts it's perhaps in her and HP's best business interest to have a little back door just in case Microsoft decides to change its Windows 8 launch window.
Whitman's words also seem to indicate that HP doesn't anticipate to have any ARM-based Windows 8 products by the end of 2012. Microsoft recently said that it currently plans to launch the ARM version around the same time as the x86 port. However, most people wouldn't be surprised if Microsoft decided to hold off on a Windows 8 ARM launch until after the regular X86 version comes out.