i think this applies to amps more, rather than pedals.
i noticed, they tend to change some things in amps while still calling them by the same name... as for pedals ... i guess i'll only be worried when:
1.) my fave pedal is modded with parts made by bankrupt companies
2.) my pedal manufacturer is in danger of being bankrupt
3.) my fave pedal isn't popular and is in danger of being replaced with a digital model or well.. just plain replaced.
4.) my fave pedal doesnt sound like any of its brothers.
if i have a pedal like that... man, that would be a nightmare... but then again, i am very easy to please. a trip to a botique pedal shop and i'll be happy again