HBO hasn't announced it so far, nor their distributor at Warner Home Video. And it's not listed at Amazon's USA site. But Amazon of Canada has begun listing DVDs
(CA$24.99 SRP) and high-def Blu-rays
(CA$29.99 SRP) for Silicon Valley - Season 4
. The listings there say to expect the title on September 12th
. No other information is available so far, nor box art. Nor do we know if this is finalized info yet; it could be subject to change. But stay tuned, and we'll update you as further information becomes available!