I hate to rain on the parade, I was really hoping this was going to be a reality, but it doesn't look like it. Following your link does show the news bit about "select HTC models" being able to be upgraded, but the Mogul doesn't seem to be one of those select models. The link you sent is configured so that it shows that the HTC Universal is your selected device, which is upgradable, but when selecting the Mogul, upgrading RAM is not an option.
I am hoping that it will become available someday soon. Sorry, yes they can do it, just not to our phone.
