From the excellent blog, Global Guerrillas:
Hezbollah is in the process of evolving into a more effective force. Nicholas Blanford has a great article over at the Christian Science Monitor on this.
New type of military:
Sheikh Hassan Nasrallah, the party's leader, in February said that Hizbullah had evolved into an "unparalleled new school" that is part guerrilla force and part conventional army.
This is aka a 4GW military.
New offensive methods:
New tactics are being taught, including how to "seize and hold" positions, a requirement that Hizbullah's guerrilla fighters – traditionally schooled in hit-and-run methods – never needed before... Jawad says that the next war will be "fought more in Israel than in Lebanon," one comment of many from various fighters that suggest Hizbullah is planning commando raids into northern Israel.
In context: Simultaneous hostage dramas during a conflict to shut down city/town centers, economic activity, and sow confusion? Broad spectrum damage. Civilians are the best defensive works possible in the modern variant of the strategic barrage. As a result, these hostage dramas could last for the duration of the conflict. Message to fighters is that if they survive: they will be released in end of conflict prisoner exchange (its not necessarily a one way mission).
Wider movement :
Hizbullah's military buildup is not confined to Shiite Lebanese. Sunnis, Christians, and Druze also are being recruited into reservist units called "Saraya," or battalions... Sheikh Afif Naboulsi, a prominent Hizbullah cleric, last month was quoted as saying that next time "the Israelis will find resistance fighters from all sects and denominations."
This is a variation on open insurgency.