It seems that reports last week about Acer choosing to stick with Blu-ray as a preferred supported medium may have been too much in haste. The HD DVD camp has issued a press release saying that Acer has joined their promotional group as well, making Acer a vendor-neutral supplier.
It wouldn't surprise me and would be a good move. Amidst some slowing sales that caused them to lose their #3 spot, they should be seeking to open up to as many markets as possible. Whether or not they will support dual-format drives is another question, but at the very least I hope Acer makes both Blu-ray and HD DVD an option for their laptops, and possibly desktops should they extend to that in the future with their purchase of Gateway.
You can read the full press release of the HD DVD camp claim that details Acer's actions.