Yes, tradecraft dice are based on attribute dice, and can raise when an attribute is increased. Specialized skills are expressed as steps, meaning a ⬆1 rating for a skill raises that tradecraft die type by one step when using that skill.
Yes. Mission points can be spent to improve skills or raise attributes. Once spent, they are lost—but a player may choose to save up mission points when they don't have enough to make the desired improvement at that time.
Surveillance is mistakenly listed in the rulebook as both a SIGINT (p. 68) and a HUMINT (p. 37) skill. Physical surveillance (tailing another person or vehicle, eavesdropping in public without special equipment, etc.) is a HUMINT skill. SIGINT is only for electronic surveillance, that is, signals intelligence.
ICON operates covertly, meaning that their operations are deniable and cannot be traced back to their true source. Agents are forbidden to reveal their status as ICON operatives without direct orders from a superior such as a station chief, and a station chief will not give such an order lightly, if at all. Agents operate under cover identities, and are [...]
No. Each fighting style uses one skill slot. Page 76 states "each fighting style uses one proficiency slot." For clarity's sake, this is changed to "skill slot" in the PDF. When choosing "hand to hand combat" as a skill, the agent must choose one fighting style. Additional fighting styles must be learned using mission points. Fighting styles are an [...]
What happens if the rules call for me to step up a d12, or step down a d4? If you are called upon to step up a d12, you may add an additional die as appropriate. Stepping up one die type (⇧1) would add a d4 to your pool. ⇧2 would add a d6, and so on. If you are told [...]