Perhaps this is a long standing change and I’ve not made a spelling mistake for a while but it seems like Google is changing the way they display “Did you mean” search results.
Rather than displaying the results for the misspelled term with a link to the correct results Google is actually claiming to show the top 2 results from the correctly spelled query and then 8 results for the misspelled query.
Strangely the first two results are actually not the same results visible for the correctly spelled query, they seem to be a mixture of the two.
This is quite big news for those people targetting misspelled queries, it’s much harder to get to the top because the first two results are almost always for the correctly spelled domains.
I say almost because it is actually possible to rank a page with correctly spelled words for an incorrectly spelled phrase, effectively giving you 2 bites of the cherry.
All you need to do is use the incorrect spelling in the anchor text pointing at the page and it will rank no problem.
If you click on the 2nd page that ranks for search engine optimiisation you see the text below:
These search terms are highlighted: search engine These terms only appear in links pointing to this page: optimiisation
Perfect example of clever SEO.