Steam Deck lead reveals Valve is funding ARM compatibility of Windows games “to expand PC gaming” and release “ultraportables” in the future
Steam Deck lead reveals Valve is funding ARM compatibility of Windows games “to expand PC gaming” and release “ultraportables” in the future
Steam Deck lead reveals Valve is funding ARM compatibility of Windows games “to expand PC gaming” and release “ultraportables” in the future

In this age of leaks and industry insider speculation I'm very impressed they've kept this under wraps for so long
They have not. I can‘t provide you the link, but it was long speculated that they are working on an ARM device. Also you cannot really hide activity in an open source project. It was just not officially communicated that these changes have been funded by Valve.
You cant hide the activity but you can hide the contributors and/or the funding.
Sure it's been speculated, but if there were obvious signs like commits in the fex repos by valve employees then wouldn't there have been more than speculation?
You could, if the person was not known to work for the company.
I find this very possible that they kept it hidden for so long. After all, Valve has been very tight on leaks for very long. Guess that HL2 dev build leak taught them a fair lot in how to protect their business from leaking info.