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The rules for jump infantry say that when they are using their jump packs [moving or assaulting] they move freely over terrain.

This leads me to believe a jump unit that walks in the movement phase and uses its jump packs to charge would roll 2d6, rerolling both if it didn't like the total [but it can't choose to re-roll one and not the other].

The quick reference summary in the back of the book lists jump infantry using their jump packs to assault as rolling 3d6 and taking the two lowest, rerolling all three if it doesn't like the result.

Which is correct?

The summary is just that - a summary - it's no replacement for the core rules. As such, in case of conflict you go with the core rules.
So in this case (if your wording is correct, I don't have the book handy), 2d6 with an optional reroll of both dice.

...though selfishly, I would dearly love for it to be the other way round.

You can reroll either or both dice, if you walk in the movement phase

No, you can only reroll both unless you have fleet then is as you said.

Its not in conflict. The 3d6" rule is covered in the Assault Phase Section under Charging Through Difficult Terrain. However, since the Jump Pack unit is ignoring the difficult terrain when they use their jump packs to charge they do not suffer the penalty to their initiative. The purpose of the Summary is to put together rules that have been introduced all over the book to make it all make sense.

So assault infantry with grenades and assault infantry without grenades are the same? Somehow that doesn't seem right. I don't think the moving freely over terrain is referring to how their initiative works in assault at all, otherwise they wouldn't be mentioning moving in the movement phase in the same sentence.

Spellbound wrote:So assault infantry with grenades and assault infantry without grenades are the same? Somehow that doesn't seem right. I don't think the moving freely over terrain is referring to how their initiative works in assault at all, otherwise they wouldn't be mentioning moving in the movement phase in the same sentence.

Check page 47, Skyborne - "When using its jump pack ... a model can move over all other models and all terrain freely." Of course, you have to be using the jump pack in the Assault phase to take advantage of this.
There is still a point in jump packers carrying grenades - in order to throw them, or use them in close combat against walkers and MCs.

Sigh, stop hating on the summary folks. So far there has been one legitimate conflict between front of book and back of book (this isn't it).

As Capt said, the summary is correct on this and agrees with the rules in unit types.

Spellbound wrote:So assault infantry with grenades and assault infantry without grenades are the same? Somehow that doesn't seem right. I don't think the moving freely over terrain is referring to how their initiative works in assault at all, otherwise they wouldn't be mentioning moving in the movement phase in the same sentence.

If the assault marines choose to use their jump packs in the movement phase they can't use them in the assault phase so having grenades would still be useful.