It won't matter. There aren't enough nationaly broadcast HD channels (or even locals) available now or anywhere in the near future to max out the bandwidth that these 2 sats from DISH will provide. Per the data that Scott provided, there is the capapcity on those 2 sats for over 1700 different channels. If Direct needs 4 sats to do that, then that means one of two things - 1. they aren't truly broadcasting in MPEG-4, or 2. They're capturing and rebroadcasting the Martian All-Day Polka Dance Fest on E.T. TV., channel 6969. So unless Direct starts farting channels out of their ass that nobody has heard of yet, I wouldn't worry about it.
This is a big flaw in peoples assumption about Dish II. DIRECTV will be in front of Dish next year. DIRECTV has the spot beam capacity on their new system with the last satellite going up this year to provide EVERY local channel in HD nationwide. This is something Dish will not be close to being able to do this year. And, probably a long ways into next year or the year after.
Dish will work around this by providing the major networks in HD for the largest markets. This will satisfy most, but this is not in any way shape or form on the scale of capacity DIRECTV has.
This is not to say Dish will be left in the dust. Dish will be able to provide the top markets with the HD people want (ABC/CBS/NBC/FOX and maybe PBS/CW). This will cover a large section of the population. Also, DIRECTV may have the capacity, but will they use it? Will DIRECTV offer LiL HD everywhere? Is it profitable to do so even if you have the empty space sitting up there on the satellite in small markets?
Dish should be able to keep up with all the nation HD channels as they are added over the next year. They can carry everything in standard definition and as channels in HD are added they can replace it with HD.
But, to compete with DIRECTV on the local HD front they will have to launch more satellites. They would have to be building the satellites right now to have a chance of getting them up next year. Covering the top 50 markets would be 66% of the population, that is probably what they can cover right away on the new system. Then it would only be limited to the majors, but few markets have independent stations in HD.
Dish will also have the advantage of having a smaller dish. Dish will also have to spend a lot less money to expand to the same carrying capacity.
I know the chance of having 100 National channels in HD by the end of the year is not looking too good, but right now they are closing in on 60 (HBO with 24 of them alone). But, most majors in most markets are broadcasting in HD, or will be soon, DIRECTV will be able to carry these locals where Dish will not be able to until they add more satellites.