I got my CCNA in February and have recently begun studying for the BSCI (step 1 of 4 towards CCNP). I consider myself an experienced, capable network engineer but find the exams a chore. The release of these new CCNA certifications has not changed my mind towards getting the CCNP certification. I feel it's a hell of a lot more valuable than having even all the CCNA specialisations. On top of that, studying for any Cisco exam is a time consuming process.

I do think the security specialisation covers topics sorely missing (edit: from vanilla CCNA). Maybe that's because that is where my experience is lacking (as opposed to VoIP or WLAN).