So what would I want to add? I want to add two land speeder storms. Which means 12 (!) scouts and two (!!!) vehicles. Released on the 18th of July none the less. On top of that I want one squad of Space Marines scouts, half of them with sniper rifles, that I split into two combat groups each boarding a storm. Fast, open topped, skimmer. It opens up for some interesting tactics for sure. I should probably drop my dreadnought if I do that and replace him with a devastator squad or something (since I plan on painting them anyways). But I would have 22 scouts and 2 skimmers to paint then. Over a weekend. Doesn't sound like a realistic plan to me :(
That said, it would be a great way to move my army up to 1500 points. Add one more Razorback to that mix, and an extra HQ (thinking something rock hard, to go in the other 2nd Razorback) and some mobile elites. Maybe on or two drop pod terminator squads. I do hope you *can* drop pod them. A squad of three land speeders would be a cool addition as well. Would make my army quite fast I hope :)
What I will not add is bikes. Not a fan of them at all. Nope, no bikes.