The proposers of bitcoin unlimited said they would like to get some review which seems reasonable, if others would like to help.
The proposal seems at first skim to be a copy of a few existing technologies from Bitcoin's roadmap and were first proposed by Greg Maxwell and others*: weak-blocks & network-compression/IBLT to reduce orphan risk, and flexcap (or a variant of it perhaps).
Perhaps they could start by explaining what it is & how it works. This might include unimplemented ideas, and a summary of what the code currently for download on the manifesto page does.
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i feel a little bit sarcasm

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i hope this thread will not waste too much dev-time for nothing in the end. PR is necessary but time is limited too.