In case you don't want to read the article, the service won't moved to paid right away. The service will move to a full paid model after 6 months to 1 year.
Of course there is apparently a clarification in the comments section -
Sulekha.com Classifieds will continue to be free. We are implementing, however, multiple options where users can *choose* to pay either before they post an ad (for additional premium ad features) or after they have fulfilled their need (if they are satisfied with our services). We remain committed to serving the widest range of transactional needs for users across multiple cities for free…while providing ways for them to pay if they choose to.
I have to say that I don't like this news (full paid for all users). Maybe they should do some kind of split where corporate etc pay for the classified but individuals don't have to. Or maybe they can even charge by category. For instance if they know that lots of people search for travel agents but few search for language classes, then they should charge those listings which are created by travel agents. Or as stated there should be a paid service for 'premium ad features'. Well we will see what happens in 6-12 months time.