From what I’ve seen here on the forum, normal to get the passports back pretty quickly, though it’s usually at least a week, I think.
The ‘service standard’ is the target processing time set by UKVI in which they have to process the application. For FLR(M), the service standard is 8 weeks.
So, I think what the letter is saying is that they will let you know whether your application will fall under the normal 8-week service standard or if it’s a more complicated application that might take longer (I.e. in that case, they’re covering themselves to stop you from complaining if it takes more than 8 weeks).
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