We know that
Hoard of the Dragon Queen (first part of the two part
Tyranny of Dragons storyline) is playable without the
Player's Handbook itself.
+Mike Mearls said so, but he also said that it would require the use of the free 15% of the
Player's Handbook. This kinda makes sense, as each part of
Tyranny of Dragons is only 96 pages long, and including rules to run as well as the adventure would lead to the use of a really small font ;)
The two parts of
Tyranny of Dragons take players from levels 1 to 7ish and 8 to 15ish respectfully.
So, where are those rules for advancement? The expo table? The spells known and spell lists? Not in the
Starter Set - that only goes up to 5th level with pre-chosen advancement.
So they
HAVE to be in those 48 pages that constitute the 15% of the
Players Handbook. I expect it will be core classes (Fighter, Cleric, Wizard and Thief) and core races only (Human, Dwarf, Elf and Halfling). I strongly suspect the 15% will skew heavily towards what we in the OSR would refer to as "
Old School Gaming", as more options would, by default, require more space to cover. (the
Starter Set includes 5 pregens, which may put a 5th class in play)
48 pages for six ability score tables, four classes, four races, 15 levels of advancement, 7 levels of spells, combat rules, healing, weapons tables, equipment tables and the like. Monsters and treasure to be found in the adventure itself.
It might be the most OSR of recent OSR releases, if economy of page count is added to the equation, as it will cover the same levels as B/X ;)