It appears to be brand-new dandelion pollen - the same stuff they are bringing in by the bucket-load - bright orange and just scattered around the hive entrance...
It's interesting that you mention this - I noticed a similar situation early this spring.
This is what I saw in the landing board, and it was piled in the grass too. Some of the bees could be seen dragging it back out of the hive before it was deposited in the cells. Apparently management was unhappy with what was being brought in, or perhaps there was too much of it coming in. Pollen was definitely not in short supply - maybe this was a case of too much supply and not as much demand, or they wanted the maple/other kinds of pollen deposited instead.
Sycamore seems to be the best fit at that time of the season for the source of this pollen...
Are the top pictures similar to what you're seeing?