A few days ago, it was revealed that every main group in Hello! Project (and Mano Erina) will be getting a Blu-ray DVD containing all of their PVs to date.
The bad news is that not all of the PVs will be in HD, but that's unavoidable because not all PVs were shot in HD and in Morning Musume's case, their early singles predate HD's (mainstream) arrival.
According to CDJapan, the following PVs will be in HD:
Morning Musume: From single 42 (Onna ga Medatte Naze Ikenai) until current (Kono Chikyuu no Heiwa wo Honki de Negatterun da yo! / Kare to Issho ni Omise ga Shitai)
Berryz Koubou: No info yet (probably will start with Otakebi Boy WAO)
C-ute: From track 14 (Indies singles are counted so starting with Shouchuu Omimai Moshiagemasu) until current (Sekai ichi HAPPY na onna no ko)
Mano Erina: From track 7 (Onegai Dakara) until current (My days for you)
S/mileage: From track 9 (Koi ni Booing Buu!) until current (Tachiagaaru)
Again, every PV collection will have all of the groups' PVs, but just the ones above will be in HD. The rest will be in standard definition.
The other awesome thing about this is the price - the most expensive is Morning Musume's (4762yen or about $55) and the cheapest ones are S/mileage's and Manoeri's (3333 yen or about $40). Those are pretty awesome deals to not only own all of the PVs, but to also see most of them in never-before-seen HD quality. I'll have to get at least one (looking at you Berryz).
If you want to buy them:
They will be released on December 21st.