I have seen similar pictures over 10 years ago. can you imagine how small it can be now? Sure its probable its small enough to fit in a syringe needle.
I can see a lot of good applications for RFID in industry to track product, but chipping people is not on. Trouble is the companies making these things are trying to 'normalise' chips in people, but it can't be 'normalised', because we've seen the Barbie heads who have volunteered to be chipped. Normal people wouldn't give their rights away so freely!