If I put an image in a post in this thread, then I can get a list of the IPs of the people who have viewed the thread. Cross refer a few threads, and I can probably isolate your individual IP.
Try it and see how many IPs you get...What I understand from this is, It's not gonna work. So seems like we are safe.
Update:
Ok seems like I have missed this from shahzadafzal.
Actually Theymos is pointing out that it's not possible anymore. bitcointalk is using image proxy which prevents any request being forwarded to the source directly from client's browser.
If you haven't notice all [img] tages are replaced like, so you will not get IP Address of the user but all requests will be coming from bitcointalk's image proxy server.
https://ip.bitcointalk.org/?u={url}
I seriously think, bitcointalk should enable Image caching on proxy server, currently it looks like caching is not enabled or used that's why we don't see any image for few [5+] seconds.