(Forgot to say that those with the end of support (NOT end of life) HD PVR 4U and 2U are the only ones who already partially need these changes, most of them will already be aware of that.)
If not already using a SLNB, the main consideration for included Hi Band usage is the LNB.
Out now goes the humble universal Twin LNB for many - it can't handle this combination of services for more than 2 Universal (Legacy) LNB inputs total for the decoder(s) under any circumstances. Nor can it now properly supply to an Explora Switch (ES), so can't be expanded that way or be ever used on an Explora.
So only still good for direct Universal (Legacy) use with a 2P, 2U or 4136. The only Hi Band included HD decoders XtraView (XV) option with this LNB is 2 x 4136's.
Those with a SATCR LNB - some may be able to handle all the changes, but MC does not do everything according to general technical specifications used internationally so that's not a certainty.
Those trying it will already know to make use of the Unicable outputs, and where applicable some use of the Universal (Legacy) output(s) when available.
The best non-SLNB option is a Quad or Quatro LNB.
Quad is recommended as it's a bit more versatile in partial failure circumstances (not something most users need to ever consider), and can be connected directly to all but the Explora decoder(s).
This Quad LNB delivers a choice of all 4 LNB parameter options as needed on each of its four outputs.
For the Quad:
Those with any Exploras, and all of those with XV who need more than 4 Universal (Legacy) LNB inputs total (or who want to instead use Unicable) - an Explora Switch (ES) would also be needed (only sold separately).
Each of the 4 LNB outputs are then connected in any order to the 4 ES inputs.
(With a Quatro LNB all those connections are instead specific. Quatros need the ES under all circumstances.)
The ES's deliver both Universal (Legacy) and Unicable outputs which can be used as needed on the decoders. The many specific setup possibilities will need to be discussed individually if required.
Note that the original version 5-1 ES is not reliable enough for using both of its Unicable output ports.
Those using Unicable (including the SATCR version) on more than one decoder also need to look at the user band settings: Smart LNB (SLNB) installations and settings
Update - note that which ES is used also needs to be considered due to newer decoder combination options, but anyone needing a new ES will end up with the latest model
24-1z, now called the Smart Switch (SS), which can cover all possibilities.
An Octo LNB (8 Universal (Legacy) output ports) can offer better advantages to some.
That should do as a start, all queries and comments welcome.
(I'll try to be around for the next few days to help further.)