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New functionality was recently enabled for Wikipedia's watchlist. The change was discussed at Wikipedia:Village pump (proposals)/Archive 83#Enable "Show changes since last visit" on watchlist, after which a Bugzilla report was filed at bugzilla:33123. It introduced a default style of watchlist highlighting for all users. Following a number of complaints about the style, the change has been temporarily reversed so that this survey may take place.
Among other things, this new functionality allows users to differentiate pages in their watchlist that they haven't visited since the last change, from pages that they have already visited. You may find this a very useful feature—it will make a watchlist similar to most email clients and forum pages, which show unread items in a way different from read items. This feature has been in use at Commons and Wiktionary for some time, so some editors will be familiar with it already.
At the moment, the change is invisible, but there are methods to make it visible right now, for yourself. Check out Wikipedia:Customizing watchlists for details.