Come down the pike

see here:
http://www.dailywritingtips.com/coming-down-the-pike/

spending coming down the pike means spending that is on it way though the process may not have started yet. It will though, no chance that it will not.

right. it's spending that's coming, but there's no connotation of increasing or decreasing. A turnpike or pike is a road, usually a fairly major one. When I was a kid, I was told that roads in the 18th and early 19th century were almost always really lousy, muddy, rutted, dirt. Private entrepreneurs would build better quality roads, for which you had to pay a toll. They'd block off the entrance to their roads with a length of timber, a pike, which was often a tree trunk. It could pivot around one end, so you paid the tollkeeper your fee, and he'd turn the pike so you could enter the road, which came to be called a turnpike. Don't know if that etymology is true or not, but I liked the story. High-quality roads where you have to pay a fee to travel fast are still sometimes called turnpikes, and some still have movable bars to keep you from going thru the tollgates without paying. So "coming down the pike" means kind of coming fast and unstoppably.

Thank you both

The expression "to come down the pike" simply means to appear, to be evident, to be in process.