Are litecoin v.s. bitcoin differences kept "up to date" ?

[piotrgal]

Hi !

I know the litecoin was created as a clone of bitcoin with few changes (like hashing algorithm or block mining interval, etc.)

I would like to ask, how this state changes over time - I mean, is it that after litecoin inception and initial differences, they both keep walking their completely independent paths,
or is there any effort made to "re-apply" the bitcoin developments back on the litecoin (of course if they make sense), so they keep differ only in that initial set of features ?