No doubt this game of cat and mouse will go on for some time. For Adblock to prosper, they need to block ads on Facebook. Likewise, for Facebook there is too much money at stake to allow Adblock to block their ads. For details on this, see: Adblock Plus and (a little) more: FB reblock: ad-blocking community finds workaround to Facebook
One thing for sure: developers from both sides will be pushing out changes on a regular basis as this battle heats up.
Of course, behind such tactics, the deeper questions are left unresolved, questions around business models and the viability of services without access to advertising revenue.