I figured this as well --- that the gentlemen was Jones himself, and that he got the information about Little Hill from someone who understood either the future or the reason that location was going to work based on the day/time/ etc.
Witnessing past events happens all the time ---- and I'm not talking about TV shows, I'm talking about Memory. In our concious states and in our sleeping states we access (and sometimes "re-live") events that happened in our past. Especially in dreams, we can even interact and change the course of those past events. Sometimes this can seem very real to us, esp in various dream states. So are we traveling into the past when we are accessing and reliving and interacting with memories? You can't say "it's not real, it's in your head" becaue it is real. It's really happening, even if it is in your head .....
Now the issue is, there is no solid evidence (yet) that merely thinking about the past actually changes what we live day to day as Reality. For example, just because I relive a bad memory where I got in an argument with my parents at age 4 --- and instead of running off to my room crying, I kill them ---- doesn't mean that in reality my parents are dead now, where as five minutes before they were enjoying a nice dinner. In other words, what goes on in my memory of past history seems to have no consequence to the realm of reality I live in. In that sense, it is "all in my head" only.
What I'm guessing Fringe is going to do,is blend those streams of reality. They will make a form of time travel possible by entering the realms of conciousness --- the "energy" where history is recorded ----- and materialize memory into our "realm" to start a new thread of history from any point they choose, even multiple threads. They are already blurring the lines of perceived reality with conciousness reality, so I'm guessing that "time-travel" will be possible by not actually traveling back to a given time, but accessing a certain point of history in "universal memory", observing it, and then materializing it and thus starting a new thread of it in "our reality".
Also, I'm not so sure what they did in this episode was teleportation by breaking down someones atomic structure and rebuildling it again --- I'm fairly certain they opened a wormhole which Jones "entered". Teleportation involves space, not necessarily space-time.
Forgive my lack of knowledge and "shop talk" when it comes to physics, I'm not sure if I described this correctly ...

Bookmarks