No, they won't. But how exactly do you think they will learn? I dont think many 3 years old will grasp what it means, but at the same time I know how I learned to program:
At 5 I was watching my dad program from across the room (it helped that it was a VIC-20 with only 22 characters per line...), and I started copying the words he was typing. Soon enough he found me with sheets of papers with line numers and "IF", "GOTO", "PRINT", "THEN" etc. written all over them, and he sat me down with the computer and showed me a few very simple things. Then left me to experiment.
3-4 years later and I had exceeded his programming skills in most respects, largely because, while I didn't understand most of it for a long time, a 5 year old will relentlessly try things and see what works because what constitutes a sufficient reward to make it fun to keep going is so much simpler. When I discovered "POKE", I spent a day entering random values, and excitedly insisting my dad or mom come see whenever I managed to get random junk on the screen or trigger weird sounds.
And as I got older and started to understand the connections, a lot of the information I needed to make those connections had already been there for me for a long time.
There's a large gap between 3 and 5, but frankly:
Give them the outrageous stuff as soon as they'll pay attention to it, and while they won't understand what most of it is about at first (doesn't matter - kids read nonsensical stuff all the time), chances are quite a few will get much further than you expect if you keep preparing them for when they are ready to start making those connections.
