Hi Jason,
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Without knowing precisely what you mean by "Big Y STR differences", it's hard to give a precise answer. However, what generally happens is that the Y-STR results from Big Y are delivered separately from the main (SNP-based) Big Y results themselves. This is because the technology used to isolate and measure the first 111 Y-STRs is fundamentally different from the rest of the test - the sample goes through a different machine.
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If you are seeing new results at levels where you've previously tested, it could simply be that new testers have come along who match you.
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If you are seeing new levels appearing (e.g. Y-67 and Y-111) that weren't there before, it's probably because the Y-STR portion of your test has finished going through this separate machine.
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If you are seeing Big Y results in your Y-STR matches (i.e. numbers of out 700+ Y-STR matches alongside your existing Y-STR results) then that means the STR component of your BigY test has been validated and your main BigY results should be ready "soon". How soon that is can depend on many factors, but is likely to be within the next fortnight or so.
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Cheers,
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Iain.
