Board Thread:Bloons Wiki and BTD News/@comment-5056929-20130809071543/@comment-3153244-20130818114023

More information to satisfy your cravings for spoilers (greedy people :P)

Bloons
Lead Bloons take 2 hits to pop, contain a Black Bloon, and are immune to Darts, Boomerangs or Shurikens. Unless a monkey is standing on the square, they also have a 19% chance of respawning each round, with their respective characteristics (Camo/Regen). All other bloon types remain the same.

Towers
These are only Tier 1 upgrades, wait 'til you see the Tier 2 upgrades ;) Switching towers subtracts 3 from your maximum energy, although if it is your first time, you only lose 1 maximum energy.

Dart Monkey: Your good ol' regular starting tower. Pops up to 1 layer of 1 bloon per turn.
 * Long Range Darts (1-0): More range. Can aim at bloons up to 2 squares in any horizontal/vertical direction (instead of 1).
 * Sharp Shots (0-1): Increased pierce. Can pop up to 2 bloons in a straight line.
 * Weakness: Lead Bloons

Boomerang Thower: Quite a powerful tower, with an irregular popping pattern. Pops up to three bloons per turn. Usage: Aim at bloon adjacent to Boomerang. Boomerang loops in a perpendicular direction and hits up to 2 more bloons.
 * Multi-Target (1-0): Pierce cap increased to 4.
 * Red Hot 'Rangs (0-1): Can pop Lead Bloons
 * Weakness: Camo Bloons

Sniper Monkey: Better against strong bloons than grouped bloons. Pops 2 layers, 1 bloon at a time. Infinite range.
 * Increased Poppage (1-0): Pops 3 layers at a time (from one bloon)
 * Faster Firing (0-1): Has a 50% chance of aiming at a second bloon.
 * Weakness: None

Ninja Monkey: Fast, deadly and efficient. Runs 3 squares instead of 2 for the normal cost of -1 energy.
 * Ninja Discipline (1-0): Increased range; can aim 1 square further in any horizontal and vertical direction.
 * Seeking Shurikens (0-1): Shuriken has 50% chance to seek a second (random) bloon adjacent to the first (including diagonals).
 * Weakness: Lead Bloons

Monkey Apprentice: Decent all-rounder tower with no weaknesses. To compensate, upgrades have a higher energy prerequisite. Pops up to 2 bloons in any horizontal/vertical direction (1 layer at a time).
 * Intense Magic (1-0): Maximum popping power increased to 3. Can only attack in 1 direction (horizontal/vertical)
 * Fireball (0-1): Final bloon has a 50% chance of losing 1 more layer.
 * Weakness: None